Track gauge in North America
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The vast majority of North American railroads are standard gauge (4 feet 8 1⁄2 inches or 1,435 mm). Exceptions include some streetcar, subway and rapid transit systems and some narrow gauge lines particularly in the west, e.g. the isolated White Pass and Yukon Route system, and the former Newfoundland Railway.
As well as the usual reasons for having one gauge i.e. being able to operate through trains without transfer arrangements, the North American continent-wide system of freight car interchange with rolling stock having the same standard gauge, couplings, and air brakes meant that individual companies could minimise their rolling stock requirements by borrowing from other companies. Peak demand periods varied over the continent, with seasonal requirements e.g. for grain shipments occurring at different times in different areas so that freight cars could be redistributed to cover peaks as required.
In 1851 the 5 ft 6 in (1,676 mm) broad gauge, called the Provincial Gauge or Indian gauge, was universally adopted as the standard gauge for the Province of Canada. However in the 1870s, most Canadian railroads (apart from some narrow gauge lines, e.g. on the island of Newfoundland) were changed to standard gauge to facilitate interchange with U.S. railroads.
Canadian railroads originally built as broad gauge included the Grand Trunk Railway which was changed to standard gauge by 1873. Other broad gauge lines were the St. Lawrence and Atlantic Railroad and the Champlain and St. Lawrence Railroad until 1873, and the Intercolonial Railway of Canada until 1875.
The narrow gauge railroad system of Guatemala no longer operates, see Rail transport in Guatemala.
Mexico currently uses standard gauge. See Rail transport in Mexico
The Panama Railroad was originally 5 ft (1,524 mm) (Russian gauge) as in much of the Southern United States. This gauge was changed to 1,435 mm (4 ft 8 1⁄2 in) when it was rebuilt in 2000, see Rail transport in Panama.
 United States
In 1886, the southern railroads agreed to coordinate changing gauge on all their tracks. After considerable debate and planning, most of the southern rail network was converted from 5 ft (1,524 mm) gauge to 4 ft 9 in (1,448 mm) gauge, then the standard of the Pennsylvania Railroad, over two remarkable days beginning on Monday, May 31, 1886. Over a period of 36 hours, tens of thousands of workers pulled the spikes from the west rail of all the broad gauge lines in the South, moved them 3 in (76 mm) east and spiked them back in place. The new gauge was close enough that standard gauge equipment could run on it without problem. By June 1886, all major railroads in North America were using approximately the same gauge. The final conversion to true standard gauge took place gradually as track was maintained. Now, the only broad-gauge rail systems in the United States are some city transit systems.
 See also
- Narrow gauge rail transport
- Narrow gauge railways in Canada
- Narrow gauge railroads in the United States